Overall, seniors are among some of the safest drivers on the road, until they get up in the 80s, when their crash and injury rate approximates teenagers,'' said Carol Thorp, spokeswoman for the Automobile Club of Southern California.

You'd think using a hands-free phone would be less distracting, so it wouldn't increase crash risk as much as using a handheld phone," Anne McCartt, IIHS vice president and one of the authors of the study, said in a statement.

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